globalchange  > 气候变化与战略
DOI: 10.1016/j.scib.2020.05.007
论文题名:
Boosting reaction kinetics and reversibility in Mott-Schottky VS2/MoS2 heterojunctions for enhanced lithium storage
作者: Dong Y.; Liu Y.; Hu Y.; Ma K.; Jiang H.; Li C.
刊名: Science Bulletin
ISSN: 20959273
出版年: 2020
卷: 65, 期:17
起始页码: 1470
结束页码: 1478
语种: 英语
中文关键词: Heterostructure ; High-energy density ; Interface effect ; Li-ion batteries ; VS2/MoS2
英文关键词: Association reactions ; Charge transfer ; Density functional theory ; Electric fields ; Heterojunctions ; Kinetics ; Layered semiconductors ; Lithium compounds ; Lithium-ion batteries ; Molybdenum compounds ; Built-in electric fields ; Charge transfer kinetics ; Electrochemical redox ; Formation energies ; Li adsorptions ; Lithium storages ; Mott-Schottky ; Specific capacities ; Reaction kinetics
英文摘要: Heterostructures have lately been recognized as a viable implement to achieve high-energy Li-ion batteries (LIBs) because the as-formed built-in electric field can greatly accelerate the charge transfer kinetics. Herein, we have constructed the Mott-Schottky heterostructured VS2/MoS2 hybrids with tailorable 1T/2H phase based on their matchable formation energy, which are made of metallic and few-layered VS2 vertically grown on MoS2 surface. The density functional theory (DFT) calculations unveil that such heterojunctions drive the rearrangement of energy band with a facilitated reaction kinetics and enhance the Li adsorption energy more than twice compared to the MoS2 surface. Furthermore, the VS2 catalytically expedites the Li–S bond fracture and meantime the enriched Mo6+ enables the sulfur anchoring toward the oriented reaction with Li+ to form Li2S, synergistically enhancing the reversibility of electrochemical redox. Consequently, the as-obtained VS2/MoS2 hybrids deliver a very large specific capacity of 1273 mAh g−1 at 0.1 A g−1 with 61% retention even at 5 A g−1. It can also stabilize 100 cycles at 0.5 A g−1 and 500 cycles at 1 A g−1. The findings provide in-depth insights into engineering heterojunctions towards the enhancement of reaction kinetics and reversibility for LIBs. © 2020 Science China Press
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/169882
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作者单位: Key Laboratory for Ultrafine Materials of Ministry of Education, Shanghai Engineering Research Center of Hierarchical Nanomaterials, School of Materials Science and Engineering, East China University of Science and Technology, Shanghai, 200237, China; School of Chemical Engineering and Technology, Sun Yat-sen University, Guangzhou, 510275, China

Recommended Citation:
Dong Y.,Liu Y.,Hu Y.,et al. Boosting reaction kinetics and reversibility in Mott-Schottky VS2/MoS2 heterojunctions for enhanced lithium storage[J]. Science Bulletin,2020-01-01,65(17)
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